I'll have to be a contrarian here.
In places like supermarkets and malls, I've seen any number of Western women - (some of whom I've known, so they weren't all 'unknowing' tourists) - who even the most laid back individual with even the faintest sliver of comprehension that he or she was living in a Muslim country would have to say were dressed inappropriately - in some cases, extremely inappropriately.
One of the worst repeat offenders was the wife of an EK captain, who, if she had as much brain as skin she displayed, would have been a Nobel Prize candidate. (No joke intended about intentions versus achievments a la Mr Obama.)